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However, the Swimming Teachers Association (STA) and Birthlight, a pregnancy, birth and parenting organisation, issued a grave statement, adding the device could cause undue stress to babies.

Kayle Burgham, STA's aquatics manager, said: "While disengaging from the world in floating tanks can be wonderfully relaxing for stressed adults; this is not what babies want or need – physically or emotionally.

"This isolated activity completely goes against the very essence of baby swimming, which is human contact: bonding with your child so they can explore the water in a safe, relaxed, fun environment."